exp 6 (CAL) calculations and graphs

[Zellmer, Robert]

I'm getting some questions about exp 6, especially about the
calc. and what sample calc. are needed and the graphs.

Don't forget there are links in Carmen for Word doc with
the report questions and an Excel file for the data report
form.

The manual and rubric states to show calc. for all types of
calculations performed.

1) For Parts A, B and C that means you should show one
delta(T) sample calculation for one part (Part A is fine).

2) The calculations for ALL the q values leading up to the
final "q" which you will be reporting in parts A, B and C.

For part A you need to show the eqns and q values for the
calculation of the heat capacity for the cup.  These are shown
on pages 38-39 in the manual.

In parts B and C there are calculations for moles which should be
shown and limiting reagent in Part B.  Also, for parts B and C show
all calculations involved in determining the heat evolved by the
reaction (Part B eqns are shown on pages 39-40 and part C are on
page 40) and the calc. for the delta H values in both parts.

For part D you're using Hess's Law as explained in the manual,
the book and my notes.  You need to show how you manipulated
each eqn and the delta H values and add them up to get delta(H3)
and delta(H4).  This means you need to write each reaction equation
used and show how you get the corresponding delta(H) for
this manipulated eqn. and then how the eqns add up to give the
desired eqn and how the delta(H) values add up.   You'll be using the
reaction eqns and delta(H) values you get in parts B and C to get rxn
3 and its delta(H) on page 40.  Then to get rxn 4 on page and its
delta(H) on page 40 you'll use rxn 3 with rxns 5 and 6 on page 41.

Remember to look at my finished graph for exp 6 to see what your
graphs should look like.  Make sure you have the proper numbers of
grid lines on both axes.  On the Temp axis (y-axis) you should have
major tic marks and gridlines every 1 degree and 10 minor gridlines
in between (every 0.1 degree).  This way you can read an extra digit
from the graph for the T_i and T_f.  The time axis (x-axis) should
have major gridlines every 1 min (every 60 secs if using seconds)
with 5 minor gridlines in between (every 0.2 min).

You can insert the best-fit lines and time-of-addition line using the
tools in Excel (got to "Insert" and then "Shapes").  These lines can be
manipulated quite easily and you can get pretty good best-fit lines,
undoubtedly better than what you can draw by hand with a ruler.
Make sure to extend the lines and cross the time-of-addition line so
you can find T_i and T_f.  You can also insert text boxes for the T_i
and T_f and time-of-addition labels.  It's really pretty easy to figure
out how to draw lines in Excel or textboxes for the T_i, T_f and "time
of addition" labels .  You'll need lots of grid lines since you'll need to
read T_i and T_f off the graph to the 2nd decimal place.

For additional help on the graphing see exp 6 help at the "Laboratory"
link on my web page.  There's an example graph there.  Make sure
each graph occupies a whole page in your report.  To get full credit for
your graphs they should look my finalized example.

As stated above, do this in Excel and insert the lines using the drawing
tools in Excel ("Insert" tab).    Do NOT graph by "hand" using graph
paper and do NOT draw the lines by hand and then scan the graph to
include in your report.  Take the Excel graph and transfer it to your
Word doc.  We will NOT accept scanned graphs.

The only thing which can be done by hand and scanned for your report is
your sample calculations.  That is always the case unless we tell you
otherwise.

 Dr. Zellmer
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